path: root/drivers/mfd/asic3.c

/*
 * driver/mfd/asic3.c
 *
 * Compaq ASIC3 support.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Copyright 2001 Compaq Computer Corporation.
 * Copyright 2004-2005 Phil Blundell
 * Copyright 2007-2008 OpenedHand Ltd.
 *
 * Authors: Phil Blundell <pb@handhelds.org>,
 *	    Samuel Ortiz <sameo@openedhand.com>
 *
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>

#include <linux/mfd/asic3.h>
#include <linux/mfd/core.h>
#include <linux/mfd/ds1wm.h>
#include <linux/mfd/tmio.h>

enum {
	ASIC3_CLOCK_SPI,
	ASIC3_CLOCK_OWM,
	ASIC3_CLOCK_PWM0,
	ASIC3_CLOCK_PWM1,
	ASIC3_CLOCK_LED0,
	ASIC3_CLOCK_LED1,
	ASIC3_CLOCK_LED2,
	ASIC3_CLOCK_SD_HOST,
	ASIC3_CLOCK_SD_BUS,
	ASIC3_CLOCK_SMBUS,
	ASIC3_CLOCK_EX0,
	ASIC3_CLOCK_EX1,
};

struct asic3_clk {
	int enabled;
	unsigned int cdex;
	unsigned long rate;
};

#define INIT_CDEX(_name, _rate)	\
	[ASIC3_CLOCK_##_name] = {		\
		.cdex = CLOCK_CDEX_##_name,	\
		.rate = _rate,			\
	}

static struct asic3_clk asic3_clk_init[] __initdata = {
	INIT_CDEX(SPI, 0),
	INIT_CDEX(OWM, 5000000),
	INIT_CDEX(PWM0, 0),
	INIT_CDEX(PWM1, 0),
	INIT_CDEX(LED0, 0),
	INIT_CDEX(LED1, 0),
	INIT_CDEX(LED2, 0),
	INIT_CDEX(SD_HOST, 24576000),
	INIT_CDEX(SD_BUS, 12288000),
	INIT_CDEX(SMBUS, 0),
	INIT_CDEX(EX0, 32768),
	INIT_CDEX(EX1, 24576000),
};

struct asic3 {
	void __iomem *mapping;
	unsigned int bus_shift;
	unsigned int irq_nr;
	unsigned int irq_base;
	spinlock_t lock;
	u16 irq_bothedge[4];
	struct gpio_chip gpio;
	struct device *dev;
	void __iomem *tmio_cnf;

	struct asic3_clk clocks[ARRAY_SIZE(asic3_clk_init)];
};

static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);

void asic3_write_register(struct asic3 *asic, unsigned int reg, u32 value)
{
	iowrite16(value, asic->mapping +
		  (reg >> asic->bus_shift));
}
EXPORT_SYMBOL_GPL(asic3_write_register);

u32 asic3_read_register(struct asic3 *asic, unsigned int reg)
{
	return ioread16(asic->mapping +
			(reg >> asic->bus_shift));
}
EXPORT_SYMBOL_GPL(asic3_read_register);

static void asic3_set_register(struct asic3 *asic, u32 reg, u32 bits, bool set)
{
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&asic->lock, flags);
	val = asic3_read_register(asic, reg);
	if (set)
		val |= bits;
	else
		val &= ~bits;
	asic3_write_register(asic, reg, val);
	spin_unlock_irqrestore(&asic->lock, flags);
}

/* IRQs */
#define MAX_ASIC_ISR_LOOPS    20
#define ASIC3_GPIO_BASE_INCR \
	(ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)

static void asic3_irq_flip_edge(struct asic3 *asic,
				u32 base, int bit)
{
	u16 edge;
	unsigned long flags;

	spin_lock_irqsave(&asic->lock, flags);
	edge = asic3_read_register(asic,
				   base + ASIC3_GPIO_EDGE_TRIGGER);
	edge ^= bit;
	asic3_write_register(asic,
			     base + ASIC3_GPIO_EDGE_TRIGGER, edge);
	spin_unlock_irqrestore(&asic->lock, flags);
}

static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
{
	struct asic3 *asic = irq_desc_get_handler_data(desc);
	struct irq_data *data = irq_desc_get_irq_data(desc);
	int iter, i;
	unsigned long flags;

	data->chip->irq_ack(data);

	for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
		u32 status;
		int bank;

		spin_lock_irqsave(&asic->lock, flags);
		status = asic3_read_register(asic,
					     ASIC3_OFFSET(INTR, P_INT_STAT));
		spin_unlock_irqrestore(&asic->lock, flags);

		/* Check all ten register bits */
		if ((status